Machine for finishing the teeth of cast-metal gear-wheels, &amp;c.



No. 894,099. Y PATENTBD JULY 21, 1908.

' G. W. BAKER.

MACHINE FOR FINISHING THE TEETH OP CAST METAL GEAR WHEELS, &0.

APPLIGATION FILED DEG.28,1907.

4 SHEETS-SHEET 1.

14771. Q I 6mm,

PATENTED JULY 21, 1908.

e. w. BAKER. MACHINE FORPINISHING THE TEETH'OF .GAST METAL GEAR WHEELS, 8w.

APPLICATION FILED 1336.23, 1907.

4 SHBETS SHEET 2.

flvwenlioz Georye a): ga rel Witness i attowng;

PATENTED JULY 21, 1908.

- G. W. BAKER. v v MACHINE FOR FINISHING THE TEETH OF CAST METAL GEAR WHEELS, 8w.

APPLICATION FILED DEG. 28,1907.

4 SHEETS-SHEET a.

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Svwenlroz (lealye [If fig Z'er I wdneguo 2 a! I. M711 k PATENTBD JULY 21, 1908 G. W. BAKER. MACHINE FOR FINISHING THE TEETH OF "EAST METAL GEAR WHEELS, 8w.

APPLIOATION FILED DEC. 28, 1907.

' 4 SHEETS-SHEET 4.

Ill/471 1x 5 tn woes To all whom may concern:

of the machine being in tachment. Fig. "12 is a section UNITED sTAT s PATENT orruon.

eEoRGEW. BAKER, 0F WILMINGTON, DELAWARE. MACHINE FOR FINISHING THE TE TH oFcAs'r-METAL GEAR-WHEELS, ac.

Specification of Letters Patent.

' Patented July 21, 1908.

. Application filed December 28, 1907. Serial No. 408,439;

citizen of the United States, resident of Wil mington, the county of Newcastle and State of Delaware, have madea certain new and useful Invention in Machines for F inishing the Teeth of Cast-Metal Gear-Wheels, &c.'; and I declare the following to be afull, clear, and exact description of the same, such as will enable others skilled in the 'art to which it appertains to make and use the in vention, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

Figure 1 is a perspective view of the inven- Be it known that I, GEORGE W. BAKER, a

'tion- Fi 2 is a front-elevation of the same showing iiferent location of the carrier for the dog and its supporting shaft. Fig. 3 is a section on the line 33, Fig. 2, the lower part elevation. Fig. 4 is a section on the line 44,, Fig. 2. Fig. 5 is a section on the line -5.-5, Fig. 2, the shaft for supporting the gear wheel being removed. Fig. 6 is a detail pers ective view of the horizontally'working sli e-and. its link connec-- tions with the operating devices therefor. Fig. 7 is a side view of'the attachment for bevel gears as applied, parts being broken away. Fig. -8 is a detail side view of. the at-' tachment. Fig. 9 is a detail end view of the same with the mandrel removed. 10, is a detail-sectional view on the line 1010, Fig. 8, with. themandrel removed. Fig. 11 is a detail side v ew of the rack supporting at on the line 12-12, Fig. 11.

The invention has relation to means for cleaning and finishing the teeth of cast metal gear wheels, which are always defective and require muchwork thereupon in order to remove the. hard scale wit sand embedded therein and other irregularities. This work is now commonly done by hand in a laborious manner and it is the object of this invention to provide a com lete, simple and practical machine, capab e of operation by unskilled workmen, which'will not only rapidly clean the teeth but will-also shape the same inside and outin an absolutely true manner, the result being gear wheels which appearto have been cut from the solid metal.

The machine is not confined in-its use to spur gears but operatesequally well u on bevel and miter gears, racks, and toot ed segments, besides a variety of other work such as face grinding,

surfacing of hard metals, etc. 1

With these objects in view the invention consists in the novel construction and combinations of' parts as hereinafter set forth.

In the accompanying drawings, illustrating the invention, the letter a, designates the supporting frame, having a horizontal bed I), provided with a slideway b,'on which a slide 0, is mounted and adapted to have movement of reciprocation. The slide has journaled'in bearings atone end thereof the shaft or spindle d, having a reduced end portion (1 upon which fits the grindingwheel e, adjustscrew rod g, having engagement with a threaded lug extension f, of the head, such rod having bearings in the horizontal bed of the machine at g, and being supported by a -collar h, thereon resting upon a transverse bridge piece it, spanning the bed and su upper end of the screw rod g,.provides for rotation of the same to head f, upon.

In order to support gear wheels of some size and weight the outer end of the. work supporting mandrel f, is designed to rest in a V-form head j, of a vertically adjustable with mandrel f and the work therecomplished by hand after the gear wheel is set at the proper height by means of the screw rod and its crank handle aforesaid.

Horizontal reciprocation of the slide 0, carrying the grinding wheel is accomplished by a hand wheel, 7c, the shaft of which has jour nal bearings in the frame a, and carries a pinion 10, having engagement with a rack c, forming a part of the slide 0.

shaft Z, having bearings near the base of the frame at one end thereof. Z Z are fast and loose pulleys upon said shaft. This shaft carries a radial arm m, extending upward to approximately the height of the frame a, and

ing nuts e, and e being provided at each. si e 92-. This head f, is carried by a vertical vertically adjust the Z, is a \driving pulley carried by a driving ported thereby. A crank handle 2', at t e support 7', the adjustment thereof being ac- I tended longitudinally of the machine around upper and lower guide pulleys or idlers n, and n, carried at the upper end of the radial arm m, and thence downward around drivingpulley Z.

In the operation of the machine, a grinding or emery wheel is selected to' correspond with the pitchof the spur gear to be ground, and placed on the reduced end ortion ofthe grinding. shaft or spindle d, w, en it is centered with respect to the mandrel f by suitable adjustment of the large compensating nut e and secured in such ad'ustment by tightening the outer nut 6 T e spur gear to be ground is then placed on the mandrel f, with collars of, at front and back secured upon the mandrel by set screws. The gear is then raised to the proper height by rotation of the screw rod g, when the machine is started and the grinding wheel run through the teeth of the gear for the proper depth through operation of the hand wheel is.

The spur gear being operated upon is turned forward or toward the operator to present successive'teeth to the action of the has contact at its 0 grinding wheel and in order to prevent backward turning of such wheel a dog 1), is pro 'vided, said dog having a longitudinal adjustment in a carrier 0, pivoted at 0 to a shaft extension 0 of the head f, such adjustment being secured by set screw p The inclination of this dog is varied by its pivotal adjustment upon the shaft 0 secured through' set screw 0 to correspond with the size of the gear wheel being operated u on, and the dog lique or cut end-portion p with the rear side of one of the teeth of the gear being finished, a slight clearance shown at being allowed in order to compensate for sight imperfections in the dimen- SlOIlSOf the teeth, which imperfection or difference, if any, will be corrected by action of the grinding wheel. As the work is turned towards the operator the dog will be automatioally raised by the gear teeth, and will fall by gravity into position again.

1, represents a bevel gear attachment for the machine, comprising a body ortion have ing a boxing r, designed to be s lipped upon the horizontal mandrel f, and a pivotal arm r having at one end thereof an arcuate slot r .9. bolt 1" engaging such slot and the body portion of the attachment and acting to secure the pivotal arm in itsadjustment, said pivotal arm having at the upper end thereof and in line therewith, a mandrel s. the adjustment bolt 7" is located in the middle of the arcuate slot T the mandrel s will When forty five degrees, and through adjustment of the pivotal arm bymeans of its slot and bolt connection with the body of the attachment, the mandrel may be made to assume any angle from thirty to sixty degrees to the horizontal, or a larger angular range may be providedfor. I

Bevel or miter gears, the teeth of which have various angles may be placed upon the mandrel s, which is adjusted to correspond, when the teeth of such gears will be pre sented to the grinding wheel horizontally.

In Fig. 9 of the drawings is shown a table for use in grinding the teeth of racks. This table,marked t, is provided with lower extensions t, cylindrically bored at t to fit upon the mandrel f The rack to be finished is placed upon this table, and throu h operation of the screw rod 9, raised to t e proper height, when the grinding wheel will be in position to act-upon the teeth thereof.

Toothed segmentsmay also have the teeth thereof sharpened in this machine, the procedure bein similar tothat for gear wheels.

Havin scribed the. invention, what I work, a reciprocatory grinding whee means.

for rotating the same, means for adjusting said slidable head and mandrel towards and away from the grinding wheel, and an. attachment device for said mandrel carrying claim an j desire to secure by Letters Patent an angularly disposed mandrel and including means for changing the angle thereof.

3. In a machine of the class described, a supporting frame, a slidable head carrying a work supporting mandrel, a horizontally working slide, a rinding wheel carried by said slide, means or reciprocating said slide and wheel, means for rotating said wheel including a driving pulley, a radial arm pivoted to the shaft thereof and having a pivotal link connection with said slide, upper and lower idler pulleys upon said radial arm, a pulley upon the shaft of said grinding wheel and an endless belt carried by said pulleys, and means for vertically adjusting said slidable head and mandrel.

4. In a'maohine of the class described, a supporting frame, a slidable head carrying a work 'supporting mandrel, a horizontally 65 have an angular relation to the horizontal of l working slide, a grinding wheel carried. hy

some!) said slide, means for reciprocating'said slide and wheel, means for rotating said wheel, and

' means for vertically adjustingsaid slidable head and mandrel including a vertical rod having threaded engagement with the head and provided with a crank arm at its upper end. i 5. In asupporting frame, a slidable'head carrying a work-supporting mandrel, a rotary reciprocatory shaft, a removable grinding wheel carried thereby, said shaft. being provided with means for lateral adjustment of said wheel thereupon to center the same with respect to said mandrel, means for rotating said shaft and wheel, and means for adjusting said slidable headand mandrel towards and away from the grinding wheel. j

6. In a machineof the class described, a supporting frame, a slidable head carryin a work supporting mandrel, a horizontaIly working slide, a rotary shaft carried thereby, a removable grinding wheel upon said shaft, said shaft being provided with right and left 7 hand threaded portions at opposite sides of the grinding wheel and adjustable nuts en gaging said threaded portions whereby the grinding wheel may be centered with respect to the mandrehmeans for reciprocating said machine of the class described, a

slide and wheel and for rotating said wheel,

and means for adjusting said slidable head 7 and mandrel towards and grinding wheel. v

7. In a machine of the class described, a supporting frame, a slidable head carrying a mandrel adapted to su port the work, a horizontally working slid e, carried by said slide, means for reciprocat' said slide and wheel including a rack alii pinion device having an o erating hand wheel, means for rotating sai Wheel including a driving pulley, a radial arm pivoted to the shaft thereof and having a pivotal link connection with said slide, upper and lower idlers upon said radial arm, a pulley upon the shaft of said grinding wheel and anendless belt carried by said pulleys and idlers, and means for vertically adjusting said slidaway from the able head and mandrel including a verticalrod having threaded engagement with the head and provided with a crank arm at its up er end.

n testimony whereof I aflix my signature, in presence of two witnesses.

GEORGE W. BAKER. Witnesses:

E. B. MODE, H. B. WARRINGTON.

a grinding wheel- 

